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Acid-Base Equilibrium
Atomic Structure And Related Patterns In The Periodic Table
Bonding And Structure, And Intermolecular Forces
Chemical Equilibrium
D-Block Elements (Transition Elements)
DESCRIPTIVE INORGANIC CHEMISTRY: Group IV (14)
DESCRIPTIVE INORGANIC CHEMISTRY: Halogens (GROUP VII or 17)
DESCRIPTIVE INORGANIC CHEMISTRY: Modern Periodic Table, Periodicity And S-Block Elements
Functional Group Chemistry And Reaction Mechanism
ORGANIC CHEMISTRY: Fundamentals
Raoult’s Law And Phase Equilibria
Reaction Kinetics
Redox Equilibrium
The Mole Concept

5/70 MCQs for:

Atomic Structure And Related Patterns In The Periodic Table

The isotopes of magnesium, ₁₂²⁴Mg and, ₁₂²⁵Mg both form ions with charge 2+. Which of the following statements about these ions is true?

₁₂²⁵Mg²⁺ has more protons than ₁₂²⁴Mg²⁺

Both ions have electronic configuration 1s²2s²2p⁶3s².

The ions have the same number of electrons but different numbers of neutrons.

The ions have the same number of neutrons but different numbers of protons.

The Uranium -238 isotope has atomic number of 92. Through the emission of an -particle, the uranium is changed into an atom of thorium. The atomic number and mass number of thorium are respectively

236 and 92

232 and 94

234 and 90

238 and 90

What characteristic of cathode rays led scientists to believe that they were negatively charged?

They were small

They were deflected towards a positive electrode

They moved quickly

They were easily deflected

Question 31-33 are based on the following electronic configuration: 1s22s22p63s23p63d104s24p65s2 The name of the group is

Noble gas

Alkaline earth metal

Alkali metal

Halogen

When the electron in a hydrogen atom moves from n = 6 to n = 2, light with a wavelength of ... nm is emitted.

411

434

657

93.8